Enzymes in Organic Chemistry VI [1]. Enantioselective Hydrolysis of 1-Chloroacetoxycycloalkylmethylphosphonates with Lipase AP 6 from Aspergillus niger and Chemoenzymatic Synthesis of Chiral, Nonracemic 1-Aminocyclohexyl- methylphosphonic Acids
作者:Frank Wuggenig、Friedrich Hammerschmidt
DOI:10.1007/pl00000099
日期:1998.4
Racemic alpha-chloroacetoxyphosphonates derived from cycloalkanecarbaldehydes and three branched aldehydes were prepared and tested for kinetic resolution by lipase AP 6 which hydrolyses preferentially the (S) esters. The enantiomeric excess and the reaction rate are significantly influenced by the size of the cycloalkyl group. The optical antipodes of alpha-hydroxycyclohexylmethylphosphonates (3d; ee 90% and greater than or equal to 99%, respectively) were transformed into the corresponding alpha-aminophosphonic acids 6.